Spiral fabric



C. E. PINK SPIRAL FABRIC 2 Sheets-Sheet l Filed Oct. 27, 1937 Illllllj.

May 16, 1939.

INVENTOR f f1 1%41. g ,f a Q 1 ATTORNEYS C. E. PINK 'SPIRAL FABRIC May 16, 1939.

Filed Oct. 27, 1937 2 Sheets-Sheet 2 2% s Q. g.

INVENTOR ATTORNEYS Patented May 16, 1939 UNITED STATES PATENT OFFICE Application October 27,

11 Claims.

In the use of spiral fabrics as belts and con: veyors, the employment of dextrorsal and sinistrorsal strands has been resorted to in constructing the fabric to prevent lateral creeping of the same on its driving or supporting pulleys. It is well known that a fabric constructed solely of dextrorsal strands is susceptible of a considerable twist or turn left handedly with its longitudinal center line as an axis while a corresponding twist or turn right handedly is precluded. Conversely, if the fabric be constructed of sinistrorsal strands, it is susceptible of a right hand twist longitudinally but resists the reverse twist. Ihis inherent disadvantage results, when a fabric is constructed of both forms of strands respectively on opposite sides thereof, in a center fullness due to the lack of resistance to twist in the the one direction and it is the object of the present invention to so construct a fabric of the two forms of strands that the anti-creeping of their joint use will be preserved without the tendency of the fabric tctwist in diiferent zones and create the objectionable center fullness.

With this object in view, the invention consists in a construction and combination of parts of which a preferred embodiment is illustrated in the accompanying drawings but to which the invention is not to be restricted. Continued use in practice may dictate certain changes or alterations and the right is claimed to make any which fall within the spirit of the invention.

In the drawings:

Figure 1 is a plan View of a spiral fabric constructed in accordance with the invention.

Figure 2 is a similar View of a modified form.

Figure 3 is a similar View of still another modication.

Figure 4 is a similar View of a still further modification.

If the invention be carried out according to the form illustrated in Figure 1, the fabric will consist of a series of groups of sections, as the groups A and B, the groups being identical in form but respectively reversed in the completed fabric, so that the latter will consist of alternate groups A and intervening groups B.

Each group consists of a plurality of sections Ill, II, I2 and I3 of which the sections I0 and II consist of sinistrorsal intertwined strands and the sections I2 and I3 of dextrorsal intertwined strands, the one strand being threaded through the other so that the convolutions of one strand are looped around the convolutions of the next. Transversely of the fabric, the sections I0 and I3 are correspondingly dimensioned and the sec- 1937, Serial N0. 171,346

tions II and I2 correspondingly dimensioned. But the sections I2 and I3 being reversely wound with respect to the sections II and I0, the former sections cannot be connected to the latter sections by intertwining, so that they are joined to such latter sections by welding, as indicated at I4.

The sections II and I2 being longer than the sections I E2 and I3, overlap transversely of the fabric and, being reversely wound, cannot have their connecting convolutions interlooped, so that in the overlapping areas, the adjoining convolutions of the different sections are arranged in intercurrent relation but around a coupling rod I5 which extends the full width of the fabric and through the interlooped convolutions of correspondingly wound sectionsthat is, the interlooped convolutions of the sections Il] and I I as well as the interlooped convolutions of the sections I2 and I3, extend around the rod, just as do the intercurrent convolutions of sections II and I2.

Where the groups A and B connect reversely wound strands are adjacent and therefore these strands must be arranged with their convolutions in intercurrent relation and the coupling of the groups effected with a coupling rod I6 around which the convolutions of adjacent strands pass.

'Ihe fabric is edged by welding the terminals of the strands, as indicated at I'I, and the rods I5 and I6 are secured against displacement by welding, as at I8 and I 9.

By arranging the coil sections and grouping them as above described, the line of connection longitudinally of the fabric between sections of reversely Wound strands is zig-zag or back and forth across the center line and this arrangement successfully resists the inherent tendency of the fabric to twist longitudinally in one direction on one side and in the reverse direction on the other side, so that the inherent disadvantage of center fullness after protracted use is overcome.

As embodied in the form shown in Figure 2, the group arrangement is omitted and the fabric consists of the sections 20 and 2| of sinistrorsal intertwined strands and the sections 22 and 23 of dextrorsal intertwined strands, the sections 20 and 23 occupying greater portions of width of the fabric than the sections 22 and 2|. The sections 20 and 22 are joined by welding, and the sections 23 and 2I similarly joined, as indicated at 24 in each instance, and coupling rods 25 couple the sections 20 and 23 longitudinally of the fabric, extending through the intercurrent convolutions of the sections 20 and 23, the interlooped convolutions of the sections 2| and 2|! and the correspondingly interlooped convolutions of the sections 23 and 22.

In this form of the invention, while the fabric throughout on each side is made up of correspondingly formed strands, the same zig-zag method of connecting the differentially wound strands is adhered to that precludes the twist resulting in the center fullness.

That form of the invention illustrated in Figure 3 is identical with the form illustrated in Figure 2 except that the edges of the fabric are margined with the duplex form of weave as generally illustrated in Patent No. 2,091,214. The sections 26 and 21 which are made up of sinistrorsallstrands are joined with the sections 29 and 28. respectively by welding, as indicated at 30, and the sections 29 and 26 are coupled inspairs toithezsections 21 and 28 by means of the coupling rods 3|. Dextrorsal short strands 26a are threaded in between the convolutions of the strands of the sections 26 ,and 21, for the full area of the sections 21 and .for that much of the area of section 26 as is equal to the area of section 21. Similarly short sinistrorsal strands 28a are threaded in between the convolutions of the sections 28 and 29. There is thus provided on opposite sides of the fabric a closely woven margin but this form of fabric has the zig-zag line of connection longitudinally between differentiated strands necessary to prevent the objectionable center` fullness.

- As the invention is embodied inthe construction shown in Figure 4, the same general plan 1 as that shown in Figure 2 is employed save that .up of sinistrorsal strands are respectively of difthe sections 3|', 32, 33 and 34 which are all made ferent lengths so that `they occupy varying areas 'transversely of the` fabric, the sections 35, `36, 31

, and 38 which are made-up of dextrorsal strands being likewise of diiferentlengths with respect to .each other but so dimensioned that the section'35 will be complemental to the section 3|, the sec- `tion 32 complementa] to .the section36 and so on to .have uniform `width ofy fabric. While the zigzag line of junction between differentiated strands obtains in'this form of the invention, it progressively .varies in the extent to :which it crosses the longitudinal center. line Aof the Vfabric.4 But the same capacity to vpreclude center fullness of the fabric is present in .this construction.

vThe invention having-been described, What is claimed as new and useful is:

. l.Y A spiral fabric4 made up of Vconnected sections respectivelycompcsed of interlaced sinisftrorsal.and'dextrorsal strands, said sections longitudinally of the fabricbeing united on a Zig-zag line crossingand recrossing` the longitudinal centerrline of the fabric.

Y 2. A spiral fabrick made up ofconnectedrsections respectively composed of'interlaced sinistrorsaland dextrorsal strands, said sections lon gitudinally of the fabric being united on a zig-'zag v line crossing and recrossing the longitudinal centerline of the fabric at right angles to said center line.

3.- A spiralfabric made up ofconnectedsecytrorsal ;transversely\of the fabric being connected on trorsal and dextrorsal strands, said sections longitudinally of the fabric being united on a zig-zag line crossing and recrossing the longitudinal center line of the fabric to equal distances on opposite sides of said center line.

4. A spiral fabric made up of connected sections respectively composed of interlaced sinistrorsal and dextrorsal strands, said sections longitudinally of the fabric being united on a Zig-Zag line crossingiand recrossing the longitudinal centerV line of the fabric at right angles to and to equal distances on opposite sides of said line.

5. A spiral fabric made up of connected sections respectively composed of interlaced sinisand dextrorsal strands, said sections straight lines and longitudinally of the fabric being united on aV zig-zag line crossing and recrossingY the longitudinal center line of the fabric.

6. A spiral fabric made up of connected sections respectively composed of interlaced sinistrorsal and dextrorsal strands, said sections transversely of the fabric being connected on straight lines at right angles to the longitudinal center line of .the fabric andlongitudinally of the fabric being united on a Zig-zag line crossingr and recrossing the longitudinal center line.

'7. A spiral fabric made `up-of connected sections respectively composed of interlaced sinistrorsal-and dextrorsal strands, said sections longitudinally of the fabric being united on a zig-Zag line crossing and recrossing the longitudinal center line of the fabric, sections'of correspondingly formed strands being on the saine yside of said zig-Zag line.

8. A spiral fabric made up of connected sections respectively composed of interlaced sinistrorsal and dextrorsal strands, said sections being arranged in groups, the sections comprising which are united on a zig-zag line longitudinally of the fabric and on straight lines transversely of the fabric, and meansloosely coupling adjacent groups of sections.

9. A spiral .fabric made up of connected sections respectively composed of interlaced sinistrorsal and dextrorsal strands, saidsections be! ing arranged in groups, thevsections comprising which are united on a zig-zag line longitudinally of the fabric and on straight lines transversely of the fabric, and means loosely coupling adjacent groups of sections, the sections of correspondingly formed strands in adjacent groups being respectively on opposite sides of the fabric.

10. A spiral fabric made up of connected sections respectively composed of.W interlaced sinis-n trorsal and'dextrorsal strands, said sections longitudinally of the fabric being united on a Zig-zag line crossing and recrossing an imaginary line extending in the direction of the length of the fabric.

11. A spiral fabric made up of connected sections respectively composed of interlaced sinistrorsal and dextrorsal strands, said sections longitudinally of the fabric being united on a zig-zag line crossing and recrossing an imaginary longitudinal line normal to the axes of the strands. CLARENCE E. PINK. 

